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At the same time IBM, manufacturer of the PowerPC 970 which powered the G5, was making the transition from a 130nm CPU fabrication process to 90nm. As has been well documented, the transition to 90nm was a lot more difficult than IBM (or Intel) anticipated. As a result, the debut of the Rev. B Power Mac G5s was delayed... and delayed... and delayed. Finally, on June 9 — just two weeks shy of an entire year since the launch of the Power Mac G5 — Apple announced a new lineup of G5s. The few who were still expecting 3.0GHz machines were disappointed, as the refreshed line topped out at 2.5GHz.
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I just opened up my G5 and looked at the setup for the fan. With hard drive removed it appears to have rubber pins holding the fan in place. I don't know if you can remove them without breaking them so I would have replacements on hand before starting. Also I cannot see how the power is hooked to the fan but since you have a new fan you should be able to figure it out. Once again good luck.
Photo: Mike CameronOther aspects of the G5's design are equally cutting-edge. The older Parallel ATA buss used to connect hard drives has been replaced by two independent Serial ATA busses, supporting a data throughput of up to 1.5Gbps per channel, which should mean significantly more audio track playback capability. To increase the rate at which data can be fed to and output from the CPU, the system features a new front side buss that can run at up to 1GHz (the two dual-processor models in the range have one for each processor). There's a 400MHz, 128-bit memory buss, and a new standard called Hyper Transport for connecting the system controller to the PCI controller and I/O subsystems. Except in the 1.6GHz bottom-of-the-range single-processor machine, old-style PCI slots have been superseded by the new PCI-X standard, which can operate at up to 133MHz compared to the previous limit of 33MHz, on two independent PCI busses that don't share bandwidth. Doesn't NuBus seem such a distant memory now? Of course, greater power comes at a compatibility cost, and many older PCI cards won't work in either the new PCI-X slots or the old-style PCI slots on the 1.6GHz G5: see the box on page 131 for more details on this situation.
Despite the clean design, the front panel nonetheless manages to conceal the optical drive as well as USB, Firewire and headphone connectors.Photo: Mike CameronAccess to the innards is via a pull-off side cover that is secured by a recessed latch on the rear panel. Removing the panel reveals a perspex cover, which may be unlatched and lifted out to provide full access through the side of the machine. If you do this when the machine is switched on, the fans rev up to full power like a Matrix hovercraft! The innards of the machine also look sharp and well-organised compared to earlier models and have been designed to allow additional drives and RAM chips to be fitted without the need for any tools at all.
The G5's superior memory bandwidth, as well as its greater CPU horsepower, should be noticeable with applications such as soft samplers, so I decided to compare the maximum polyphony using a RAM-based program (rather than samples streamed from hard drive) in Emagic's EXS24. There was an obvious improvement, but nothing like as great as with Space Designer; my G4 800 just managed 150 voices, while the G5 delivered around 400 to 450 voices.
Not only does the G5 provide Mac users with a very significant power hike, it is also very cheap for what it delivers. Even the top dual-processor model costs around 30 percent less than my old Mac SE30 with its monochrome 9-inch screen, 20MB hard drive and 4MB of memory cost me in the mid-'80s! It also comes with stereo digital I/O and dual monitor support as standard, is much quieter than the previous Apple G4 machines and it looks fantastic! The ability to support up to 8GB of RAM is good news for those using large sample libraries, and the faster internal drives should increase the number of available audio tracks. DVD and CD-R burning is built in, so there are no backup problems and the only restriction, if this still applies to you, is that you no longer have the option to run 'proper' OS 9. Classic Mode is included, of course, but although this runs OS 9 word processors and so on, it's useless for most music applications. There's also the issue of the 3.3V PCI slots, and many Mac users migrating to a G5 will need to budget for upgrading or replacing their audio interfaces. Nevertheless, the G5 definitely has that 'I must possess it!' factor.
The previous PowerMac G5 design was in dire need of additional USB 2.0 ports, and the Mac Pro addresses that need. Of course the Apple keyboard that ships with the system gives you another two USB 2.0 ports, but they are unpowered making them useless for pretty much everything but a mouse. Apple's Cinema Displays also feature built in hubs (USB 2.0 and FireWire) to help give you more places to plug in.
The commercial depicts a user getting 'blown out' of the side of his house, with the camera zoomingin to show a PowerMac G5 and Cinema Display -- with a voice over stating "Introducing the PowerMac G5 -- the world's fastest, most powerful, personal computer."
Each server is based on IBM's 90nm PowerPC 970FX chip, the successor to the 130nm 970 used in the desktops. Fabrication at 90nm plus the chip's new PowerTune power conservation system are what allowed Apple to cram the processor into the Xserve's 1U shell (see IBM claims massive power cut for 90nm G5).
System X achieved some notoriety last year when the November 2003 Top 500 supercomputer list listed the Virginia Tech rig at number three, rating it the most powerful university supercomputer and the biggest number cruncher based on a mainstream desktop CPU.
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